Malaysian jet's disappearance a 'deliberate' action, PM says

(CNN) -- The Malaysian Prime Minister stopped short of calling the disappearance of Flight 370 a hijacking, but said Saturday the jet veered off course due to apparent deliberate action taken by someone aboard.

With new clues, the search for the missing Malaysian Airlines plane entered a second agonizing week.

Authorities refocused their investigation on the crew and passengers and widened their targeted area to a large swath of geography. The arc of possible places the plane could have flown bends as far north as Kazakhstan and south to the vast, empty waters of the Indian Ocean.

\"Evidence is consistent with someone acting deliberately from inside the plane,\" said Prime Minister Najib Razak, officially confirming the plane's disappearance was not caused by an accident.

\"Despite media reports that the plane was hijacked, we are investigating all major possibilities on what caused MH370 to deviate,\" he said.

Military radar showed the jetliner flew in a westerly direction back over the Malaysian peninsula before turning northwest toward the Bay of Bengal or southwest into the Indian Ocean, Najib said.

\"Up until the point at which it left military primary radar coverage, these movements are consistent with deliberate action by someone on the plane,\" he said.

Investigators, he said, have confirmed by looking at the raw satellite data that the plane in question was the Malaysia Airlines jet.

The same conclusion was reached by the U.S. Federal Aviation Administration, the U.S. National Transportation Safety Board, the British Air Accidents Investigation Branch and the Malaysian authorities, all of which were working separately with the same data, he said.

The new satellite information, Najib said, leads authorities to be fairly certain that someone disabled the Aircraft Communications Addressing and Reporting System, or ACARS, just before the aircraft reached the east coast of peninsular Malaysia.

\"Shortly afterward, near the border between Malaysian and Vietnamese air traffic control,\" Najib said, \"the aircraft's transponder was switched off.\"

Pilot's home searched

After Najib spoke with reporters, a source close to the investigation told CNN that Malaysian police had searched the home of pilot Zaharie Ahmad Shah, 53. Shah lives in a gated community in Shah Alam, outside Kuala Lumpur.

Police made no comment about their activities at the home of co-pilot, Fariq Ab Hamid, 27. Two vans exited the home carrying small bags, similar to shopping bags, but it was unclear whether the bags were taken from the home.

Kazakhstan to Indian Ocean

As the focus of the investigation shifted, so, too, has the focus of the search.

Information from international and Malaysian officials indicate that the jet may have flown for more than seven hours after the last contact with the pilots.

Flight 270 took off from Kuala Lumpur at 12:41 a.m. The last satellite communication from the plane occurred at 8:11 a.m., Najib said, well past the scheduled arrival time in Beijing.

That last communication, Najib said, was in one of two possible corridors: a northern corridor stretching from the border of Kazakhstan and Turkmenistan to northern Thailand and a southern corridor stretching from Indonesia to the southern Indian Ocean.

\"Due to the type of satellite data, we are unable to confirm the precise location of the plane when it last made contact with the satellite,\" Najib said.

Because the northern parts of the arc include some tightly guarded airspace over India, Pakistan, and even some U.S. installations in Afghanistan, U.S. authorities believe it more likely the aircraft crashed into waters outside of the reach of radar south of India, one U.S. official told CNN. If it had flown farther north, it's likely it would have been detected by radar.

Najib said authorities are ending search operations in the South China Sea and reassessing the deployment of assets.

\"This new satellite information has a significant impact on the nature and scope of the search operation,\" he said.

Investigators, he said, have confirmed by looking at the raw satellite data that the plane in question was the Malaysia Airlines jet.

The same conclusion was reached by the U.S. Federal Aviation Administration, the U.S. National Transportation Safety Board, the British Air Accidents Investigation Branch and the Malaysian authorities, all of whom were working separately with the same data, he said.

Families hold onto hope

For the families and loved ones of the 239 passengers aboard Flight 370, Saturday was Day 8 of anguish. Some found comfort that there is no evidence the plane made impact.

The father of one passenger watched Najib's news conference at a Beijing hotel. He said he hoped the plane was hijacked because that gave him reason to think his son was alive.

\"I hope they are alive no matter how small the chance is,\" he said.

International effort

Given that the new search area involves a number of countries, the relevant foreign embassies have been given access to the new information. Malaysia's Foreign Ministry will brief the governments that had passengers aboard the plane and will brief the relatives of the passengers and crew.

Shortly after Najib delivered his remarks, China demanded that Malaysia provide more information on the investigation.

\"Today is the 8th day of the missing MH370, and the plane is still yet to be found,\" said a pointed statement from the foreign ministry. \"Time is life.\"

China is sending technical experts to join the investigation, and two Chinese search vessels headed for the Strait of Malacca, according to the state-run Xinhua news agency.

After wrapping a search that lasted close to three days in the Gulf of Thailand, the Haikou Missile Destroyer is due to reach the Strait of Malacca late Saturday. Another vessel, the Yongxingdao, equipped with underwater robots and rescue boats, is set to join the search in the Strait of Malacca after concluding its search in the eastern part of the Gulf of Thailand.

Flight 370 was carrying 154 Chinese passengers.

Plane was taking 'strange path'

Hours before Najib's announcement, U.S. officials told CNN the flight had made drastic changes in altitude and direction after disappearing from civilian radar.

The more U.S. officials learn about the flight, \"the more difficult to write off\" the idea that some type of human intervention was involved, an official familiar with the investigation said.

CNN has learned that a classified analysis of electronic and satellite data suggests the flight may have crashed in the Bay of Bengal or elsewhere in the Indian Ocean.

Taken together, the data point toward a possible scenario in which someone may have taken control of the plane for some unknown purpose.

The jetliner was flying \"a strange path,\" a U.S. official said on condition of anonymity. The details of the radar readings were first reported by The New York Times on Friday.

Malaysian military radar showed the plane climbing to 45,000 feet -- which is above its approved altitude limit -- soon after disappearing from civilian radar screens and then dropping to 23,000 feet before climbing again, the official said.

Air traffic controllers outside Kuala Lumpur said they lost contact with the plane on March 8 at 1:30 a.m. local time, about 45 minutes after takeoff. The Prime Minister said its last communication with a satellite was at 8:11 a.m. the same day, but its precise location was unclear.

Najib noted that theories and conspiracy theories on what happened abound.

\"There has been intense speculation,\" Najib said. \"We understand the desperate need for information on behalf of the families and those watching around the world. But we have a responsibility to the investigation and the families to only release information that has been corroborated.\"